what is loop.js fr?

loop.js is a TypeScript framework for running an AI agent repeatedly toward a stated goal until a separate judge agent confirms the work is actually finished. Instead of prompting an AI assistant one message at a time and manually deciding when to stop, a developer defines a goal, a description of what counts as done, and limits on rounds, cost, and time, then lets the framework run the agent in a loop until that bar is met or a limit is hit. The core idea is separating the worker from the judge. Each round of work starts with a fresh context and reads back notes the previous round left on disk, so long runs do not accumulate drift the way one giant conversation would. A separate Verify agent, which can even use a cheaper model and by default cannot make changes, checks each round's result and only its verdict decides whether the loop is done. If the answer is not yet, it must give a reason that gets passed into the next round, and a goal that can never be satisfied ends in an explicit give-up rather than burning through the whole budget. Cost and safety are handled through built in guards: a total dollar limit, a maximum number of rounds, and a timeout per round, all defaulting to tight values so a first run stays cheap. All state is stored on disk, so a run can crash, resume, and even overlap with a scheduled trigger without duplicating work, thanks to a lock that detects a dead owner and takes over. Scheduling is done through loop cron, which installs into an existing scheduler like crontab, launchd, or Windows Task Scheduler, or deploys to the Modal cloud platform, without loop.js running its own background daemon. The README gives example uses ranging from building a game until tests pass, to writing a daily market brief, auditing a trading strategy's orders each day, and keeping recurring chores like dependency updates or test coverage on track. Getting started involves scaffolding a new project with npm, installing dependencies, and setting an Anthropic API key, since the agents run on the Claude Agent SDK. The project is released under the Apache 2.0 license.